CN110441605A - Measure the method for the coil resistance of VCM and the VCM driving device for it - Google Patents
Measure the method for the coil resistance of VCM and the VCM driving device for it Download PDFInfo
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- CN110441605A CN110441605A CN201910325934.5A CN201910325934A CN110441605A CN 110441605 A CN110441605 A CN 110441605A CN 201910325934 A CN201910325934 A CN 201910325934A CN 110441605 A CN110441605 A CN 110441605A
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- 238000005259 measurement Methods 0.000 claims abstract description 26
- 238000004891 communication Methods 0.000 claims description 25
- 239000013078 crystal Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 description 8
- 230000005611 electricity Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011982 device technology Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/032—Reciprocating, oscillating or vibrating motors
- H02P25/034—Voice coil motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/02—Arrangements for regulating or controlling the speed or torque of electric DC motors the DC motors being of the linear type
- H02P7/025—Arrangements for regulating or controlling the speed or torque of electric DC motors the DC motors being of the linear type the DC motors being of the moving coil type, e.g. voice coil motors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
- H04N23/682—Vibration or motion blur correction
- H04N23/685—Vibration or motion blur correction performed by mechanical compensation
- H04N23/687—Vibration or motion blur correction performed by mechanical compensation by shifting the lens or sensor position
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
- G03B2205/0053—Driving means for the movement of one or more optical element
- G03B2205/0069—Driving means for the movement of one or more optical element using electromagnetic actuators, e.g. voice coils
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Control Of Linear Motors (AREA)
- Measuring Magnetic Variables (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The VCM driving device of driving current is provided to external coil as by the first electric current input and output terminal and the second electric current input and output terminal, the VCM driving device includes with 4 transistors and the coil drive portion of the first current source for together constituting with H- bridge circuit with the coil, feed back the feedback path of the potential difference between the first electric current input and output terminal and the second electric current input and output terminal, ADC(analog-digital converter), first switch and control unit, the control unit is during mode operation of the VCM driving device to measure the resistance value of the coil, control first current source, keep it turned on only one transistor in 4 transistors, will pass through the coil, flow through the first pre-determined measurement electric current, first current source is controlled simultaneously, with toilet State the first current source output the first measurement electric current, and control the first switch, so that the feedback path is connected to the input terminal of the ADC by first switch, so that the potential difference is input into the ADC, and, based on the value and the potential difference of the first measurement electric current, the resistance value of the coil is calculated.
Description
Technical field
The present invention relates to the VCM driving devices of driving VCM, more particularly to can measure and provide the VCM coil for including
Resistance value technology.
Background technique
Fig. 1 shows the structure of the VCM driving device 10 of one embodiment.
VCM driving device 10 may include Hall sensor 110, ADC130, PID control portion 140, output control unit
(Output Control) 145, coil drive portion 150, LDO141, EEPROM(electricallyerasable ROM (EEROM)) 142,
BGR143, Hall bias voltage driving portion (Hall Bias) 160 and I2C interface 170.The coil drive portion 150 can play
The function that the electric current for the VCM that inflow is installed in autofocus lens is driven.Hall bias voltage can also be replaced to drive
It moves portion 160 and uses Hall bias current driving portion 160.
VCM driving device 10 can control the movement of the filming apparatus including lens and the VCM for adjusting the focal length of lens.
Moreover, VCM driving device 10 can use Hall sensor 110, the position of lens is perceived and corrected.
Hall sensor 110 can export the differential wave about lens present position.
Hall offset cancellation portion 125 and enlarging section 120, which can play, amplifies the differential wave of the output, and
The shift function of desirable value is added in the value of the differential wave or the enlarged differential wave.Hall offset cancellation portion
125 and enlarging section 120 can have following composition, that is, when VCM driving device 10 controls the filming apparatus so that
The input range of ADC130 can be with exhaustive all of and the specific position that lens do not occur can not be detected by ADC130
Situation, keep moving range of the lens in lens barrel and the input range of the ADC critically consistent with each other each other.
ADC130 can be by the voltage value of the amplification and displacement inputted from Hall offset cancellation portion 125 and enlarging section 120
Vadc is transformed into digital value and exports.
PID control portion 140 can check whether generation mistake, to output for the digital value for receiving input from ADC130
Control unit 145 provides the digital value Jing Guo the checking process.
Output control unit 145 can be exported according to the digital value with relevant to the driving current that will be provided to VCM
The output valve of value.
Coil drive portion 150 can drive VCM according to the output valve of output control unit 145.
Hall sensor 110 can be operated required bias voltage or electricity by Hall bias voltage or current drive unit 160
Stream is supplied to Hall sensor.The susceptibility of the Hall sensor 110 can according to the size of Hall bias voltage or electric current and
It is different.
VCM driving device 10 can have totally 6 input and output terminals.GND192 is to input base to VCM driving device 10
The terminal of quasi- current potential.SDA172 is the terminal for the data input and output of I2C communication protocol.SCL171 is that input and output are based on
The terminal of the clock of I2C communication protocol.VDD191 is the terminal that driving power is inputted to VCM driving device 10.First electric current is defeated
Enter output terminal (OUTP) 181 and the second electric current input and output terminal (OUTN) 182 is the VCM exported for VCM driving device 10
The terminal pair of driving current input and output.From the first electric current input and output terminal (OUTP) (or the second electric current input and output terminal
(OUTN)) the VCM driving current exported passes through the second electric current input and output terminal (OUTN) (or the first electric current input/output terminal
Sub (OUTP)) it re-enters.First electric current input and output terminal (OUTP) and the second electric current input and output terminal (OUTN) can be with
It is connected to the both ends for the coil 240 that VCM includes.The VCM driving current can be flowed by the coil 240.
Fig. 2 shows the appearance and terminal of the VCM210 provided according to one embodiment.
VCM210 may include the coil 240.
(a) of Fig. 2 is the perspective view of the VCM210 of one embodiment, and (b) of Fig. 2, which is shown, is exposed to 4 of VCM210
Input and output terminal.In the outside of VCM210, above-mentioned GND192, SDA172, SCL171 and VDD191 can expose.Moreover,
Above-mentioned OUTP181 and OUTN182 can not be exposed to the outside of VCM210.
Fig. 3 shows the autofocus lens drive system of the one embodiment constituted including VCM and VCM driving device.
Shell 21 may include the lens barrel (lens barrel) 22 with lens 220 and magnet 23, keep lens 220 smooth
Mobile ball (ball) 24 and coil 240.The auto-focusing with moving up and down for lens of lens 220.
When lens to be made are moved to target position, the mode of feedback control VCM can use, be moved to lens described
Target position.At this point, Hall sensor 110 can be perceived about the present of 220 present position of lens for the feedback control
Positional value simultaneously exports.Moreover, feedback control VCM, until present position value 131, PU and the target position phase of the detection
Until simultaneously.The target position can define on the y-axis as 220 optical axis of lens, can have from infinitely small position (y=
0) to the value between infinitely great position (y=1023).
Fig. 4 shows the composition figure of the autofocus lens drive system of one embodiment.
In the VCM driving device 10 of one embodiment, description, can provide 6 terminals, that is, can as shown in figure 1
To provide SCL171, SDA172, OUTP181, OUTN182, VDD191 and GND192.
VCM driving device 10 can control the movement of filming apparatus 20, and the filming apparatus 20 includes lens 220, to logical
The incident light of lens 220 is crossed to carry out the imaging sensor 230 of light, adjust the VCM210 of 220 focal length of lens.Moreover, VCM drives
Dynamic device 10 can use Hall sensor 110, perceive the position of lens 220.
Magnet 250 and coil 240 can be installed in filming apparatus 20.Magnet 250 can be with fixed configurations in lens
220.If driving current I is provided to coil 240, by means of the electromagnetic force formed between magnet 250 and coil 240, lens
220 position can change.
The order that VCM driving device 10 can be provided by SCL171 and SDA172, receiving host 30.Host 30 can mention
For so that 220 focal length of lens has the order for the value for meeting user's intention.Therefore, host 30 can be connect by user interface 40
Receive the input of user.
Fig. 5 graphical representation of exemplary operating condition of each drive mode in coil drive portion 150 shown in FIG. 1.
Coil drive portion 150 may include 4 transistors 51,52,53,54 for output driving current I.In 4 crystalline substances
Body pipe 51,52,53,54 is connected with coil 240, forms the circuit of so-called H- bridge form.In Fig. 5, in order to help to understand, not only
It is 4 transistors 51,52,53,54, also illustrates coil 210 together.
Each transistor for example can be respectively FET.At this point, being input to the control of each grid of transistor 51,52,53,54
Voltage processed can receive offer from output control unit 145.
As shown in figure 5, normal coil driving portion 150 has 4 kinds of modes.(a) for representing first mode is standby mode, generation
It (b) of table second mode and (c) is stop mode, (d) for representing the third mode is forward current drive mode, represents the
(e) of four modes is backward current drive mode.
For (a) of Fig. 5,4 transistors 51,52,53,54 all have off state.
For (b) of Fig. 5, only have transistor 51,52 that there is off state in 4 transistors 51,52,53,54.
For (c) of Fig. 5, only have transistor 53,54 that there is off state in 4 transistors 51,52,53,54.
For (d) of Fig. 5, only have transistor 52,53 that there is off state in 4 transistors 51,52,53,54.
For (e) of Fig. 5, only have transistor 51,54 that there is off state in 4 transistors 51,52,53,54.
In general, the mode of the operation mode in coil drive portion 150 as shown in Figure 5 is constituted, provided that being different from this
Mode, then it is to reach other technical goal.In operation mode shown in Fig. 5, do not prompt 4 transistors 51,
52, only certain one mode with open state in 53,54.
Above-mentioned VCM driving device 10 can be provided with VCM210 integration.For example, VCM driving device 10 can be installed on
It is provided in the shell of VCM210, at this point, VCM driving device 10 can not be exposed to except VCM210 shell.Even if this
In the case of, VCM driving device 10 need to also receive input power from outside, or receive to provide the communication channel with outside, for this purpose, institute
SCL171, SDA172, VDD191 and GND192 terminal needed can be exposed to except the shell of VCM210.In contrast to this, VCM drives
OUTP181 and OUTN182 in dynamic 10 terminal of device, due to the coil 240 being attached only in VCM210, thus OUTP181 and
OUTN182 terminal does not need to be exposed to except the shell of VCM210.
On the other hand, the parameter value stored in register of VCM driving device 10 etc. can depend on the resistance value.Cause
This, it is to be understood that be connected to VCM driving device 10 and the VCM210 that uses included by the accurate resistance that has of coil 240
Value.But coil 240 included by the VCM210 that uses of specific user equipment preferably have in the ideal case it is all identical
Resistance value, but according to manufacture deviation, resistance value is had differences.Therefore, a kind of resistance value measuring each coil 240 need to be provided
Method, for this purpose, two terminals of coil 240 or being connected to OUTP181 the and OUTN182 terminal of 240 two terminals of coil
It need to be exposed to except the shell of VCM210, but due to other reasons, cannot achieve this composition, at this time the problem is that not having
The method for measuring the resistance value of each coil 240.
Summary of the invention
(technical problems to be solved)
The present invention is directed to the modes of the resistance for the coil for including as measurement VCM, provide a kind of skill using VCM driving device
Art.
The present invention is intended to provide a kind of technology, itself with regard to VCM, in the state that coil terminals do not go out to outside, survey
Coil resistance is measured, even if coil state and deviation can be also managed, after shipment, even if being installed in camera in production
After module, the state of coil also will appreciate that.
(means solved the problems, such as)
A kind of viewpoint according to the present invention can provide a kind of VCM driving device 10, pass through the first electric current input and output terminal
(OUTP) and the second electric current input and output terminal (OUTN), driving current is provided to external coil 240.The VCM driving dress
Setting 10 may include: coil drive portion 150 comprising with the coil together constitute with H- bridge circuit 4 transistors 51,52,
53,54 and first current source 55；It feeds back between the first electric current input and output terminal and the second electric current input and output terminal
Potential difference feedback path P1；ADC130；First switch 19；And control unit.At this point, the control unit can be in the VCM
During mode operation of the driving device to measure the resistance value of the coil, only by a transistor in 4 transistors
Open state is remained, will pass through the coil, pre-determined first is made to measure electric current flowing, and controls first electricity
Stream source, so that first current source output the first measurement electric current, and the first switch is controlled, so that first switch will
The feedback path is connected to the input terminal of the ADC, so that the potential difference is input into the ADC, moreover, based on described
The value and the potential difference of first measurement electric current, calculate the resistance value of the coil.
At this point, the current output terminal in two terminals of first current source can be inputted by first electric current
Certain one in output terminal and the second electric current input and output terminal is connected to a terminal of the coil, remains institute
A transistor for stating open state is the another terminal person that the coil is connected in 4 transistors.
At this point, its feature can be, the control unit measures the resistance value of the coil in the VCM driving device
Mode except other mode operations when, control so that first current source output substantially with 0 value electric current, or control
The current output terminal that first current source is made is not attached to the first electric current input and output terminal and described
The state of two electric current input and output terminals.
At this point, the VCM driving device can further include that there is the Hall sensor voltage of Hall sensor 110 to provide
Portion, other mode operations of the control unit except mode of the VCM driving device to measure the resistance value of the coil
When, it can control the first switch, so that the potential difference is not input into the ADC, but make the Hall sensor
The output voltage in voltage offer portion is input into the ADC.
At this point, the VCM driving device can be with further include: PID control portion 140 checks from the ADC and receives input
Whether digital value occurs mistake；And output control unit 145, generate 4 transistors for including in control coil driving portion
Unlatching off state control signal；The control unit includes the PID control portion or the output control unit.
At this point, the VCM driving device can be with further include: storage unit 142；Communication interface comprising communication clock terminal
171 and communication data terminal 172.Moreover, if receiving pre-determined order by the communication interface, then the control
Portion makes the mode for being converted into measuring the resistance value of the coil, the resistance value of the coil of the calculating is stored in described
Storage unit, or outside is supplied to by the communication interface.
The storage unit can be EEPROM.
The communication clock terminal and communication data terminal can be respectively serial communication clock terminal and serial communication number
According to terminal.
The driving device of another viewpoint of the present invention may include: above-mentioned VCM driving device；And including the coil
VCM；The VCM driving device can be installed in the shell of the VCM, two terminals, first electric current of the coil
Input and output terminal and the second electric current input and output terminal can not be exposed to the shell exterior of the VCM, in the VCM
Serial communication clock terminal 171, serial communication data terminal 172, power supply terminal VDD and the reference potential formed in driving device
Terminal GND can be exposed to the shell exterior of the VCM.
(The effect of invention)
According to the present invention, the method as the resistance of the measurement VCM coil for including, can provide a kind of utilization VCM driving device
Technology.
According to the present invention it is possible to a kind of technology be provided, so that itself with regard to VCM, not going out in coil terminals to outside
Under state, measuring coil resistance, even if coil state and deviation can be also managed, after shipment, even if installing additional in production
After camera module, the state of coil also will appreciate that.
Detailed description of the invention
Fig. 1 shows the structure of the VCM driving device 10 of one embodiment.
Fig. 2 shows the appearance and terminal of the VCM210 provided according to one embodiment.
Fig. 3 shows the autofocus lens drive system of the one embodiment constituted including VCM and VCM driving device.
Fig. 4 shows the composition figure of the autofocus lens drive system of one embodiment.
The operating condition of coil drive portion 150 each drive mode shown in Fig. 5 graphical representation of exemplary Fig. 1.
Fig. 6 shows the structure for the VCM driving device 10 that the present invention is provided according to one embodiment.
Fig. 7 shows the structure of coil drive portion shown in Fig. 6 150.
Specific embodiment
Below with reference to the accompanying drawings, illustrate the embodiment of the present invention.But the implementation that the present invention is not limited to illustrate in this specification
Example, can be embodied with various different shapes.Term used in this specification is used to help the understanding of embodiment, does not really want to limit
The meaning of the scope of the invention.In addition, as long as sentence, which is not known, indicates that meaning, singular form used below are also wrapped in contrast to this
Include plural form.
Fig. 6 shows the structure for the VCM driving device 10 that the present invention is provided according to one embodiment.
VCM driving device 10 may include Hall sensor 110, ADC130, PID control portion 140, output control unit 145,
Coil drive portion 150, LDO141, storage unit 142, BGR143, Hall bias voltage driving portion 160 and I2C interface 170.It is described
Coil drive portion 150 can play the function of being driven to the electric current for flowing into VCM.
Storage unit 142 can be EEPROM.
In addition, VCM driving device 10 include above-mentioned SCL171, SDA172, VDD191, GND192, VCM210,
OUTP181 and OUTN182.
The constituent element of Fig. 6 prompt can execute function illustrated in fig. 1.
VCM driving device 10 can control the movement of filming apparatus, and the filming apparatus includes lens and adjusts described
The VCM of mirror focal length.Moreover, VCM driving device 10 can use Hall sensor 110, the position of lens is perceived and corrected.
Hall sensor 110 can export the differential wave about lens present position.
Hall offset cancellation portion 125 and enlarging section 120, which can play, amplifies the differential wave of the output, and
The shift function of desirable value is added in the value of the differential wave or the enlarged differential wave.Hall offset cancellation portion
125 and enlarging section 120 can have following composition, that is, when VCM driving device 10 controls the filming apparatus so that
The input range of ADC130 can be with exhaustive all of and the specific position that lens do not occur can not be detected by ADC130
Situation, while keeping the input range of moving range of the lens in lens barrel and the ADC critically consistent each other.
It in the present specification, can be by the function including Hall sensor 110, Hall offset cancellation portion 125 and enlarging section 120
Energy portion is known as Hall sensor voltage offer portion.
The voltage value amplified and shift that ADC130 can will be inputted from Hall offset cancellation portion 125 and enlarging section 120
Vadc is transformed into digital value and is exported.
PID control portion 140 can check whether generation mistake, Ke Yixiang for the digital value for receiving input from ADC130
Output control unit 145 provides the digital value Jing Guo the checking process.
Output control unit 145 can be exported according to the digital value with relevant to the driving current that will be provided to VCM
The output valve of value.
Coil drive portion 150 can drive VCM according to the output valve of output control unit 145.
Hall sensor 110 can be operated required bias voltage or electricity by Hall bias voltage or current drive unit 160
Stream is supplied to Hall sensor.The susceptibility of the Hall sensor 110 can according to the size of Hall bias voltage or electric current and
It is different.
VCM driving device 10 can have totally 6 input and output terminals.1. GND192 is inputted to VCM driving device 10
The terminal of reference potential.2. SDA172 is the terminal for the data input and output of I2C communication protocol.3. SCL171 is input and output
The terminal of clock based on I2C communication protocol.4. VDD191 is the terminal for inputting driving power to VCM driving device 10.⑤
OUTP181 and 6. OUTN182 are the terminals pair of the VCM driving current input and output exported for VCM driving device 10.From
OUTP181(or OUTN182) output VCM driving current, pass through OUTN182(or OUTP181) re-enter.OUTP181 and
OUTN182 can connect in the both ends of the VCM coil 240 for including.The VCM driving current can be flowed by the coil 240
It is dynamic.
On the other hand, if comparing Fig. 1 and Fig. 6, VCM driving device 10 shown in fig. 6 is there are multiple and different compositions, and
One, further include first switch 19, second, further includes for the voltage difference between OUTP and OUTN node to be supplied to ADC130 input
The feedback path P1 of terminal, third, the composition change in coil drive portion 150.Referring to Fig. 6 and Fig. 7, it is explained.
Fig. 7 shows the structure in coil drive portion 150 shown in fig. 6.
Coil drive portion 150 may include 4 transistors 51,52,53,54 for output driving current I.In 4 crystalline substances
Body pipe 51,52,53,54 can connect the coil 210 outside coil drive portion 150, form the electricity of so-called H- bridge form
Road.In Fig. 7, in order to help to understand, 4 transistors 51,52,53,54 is not only, also illustrate coil 210 together.
Two terminals OUT1, OUT2 connecting in coil drive portion 150 with coil 210 can be and drive dress with as VCM
The OUTP181 and OUTN182 of 10 input and output terminals are set in electrically identical node.
In addition, coil drive portion 150 further includes providing the first current source 55 of DC current.User adjustable first
The value for the DC current that current source 55 exports.
Current output terminal in two terminals of the first current source 55 can be connected to coil as shown in (a) of Fig. 7
The first terminal OUT1 of driving portion 150, or shown in (b) such as fig. 7, it is connected to the Second terminal OUT2 in coil drive portion 150.
Coil drive portion 150 shown in Fig. 7 can be as shown in figure 5, have first mode to fourth mode, that is, have to
Machine mode, stop mode, forward current drive mode, backward current drive mode.
Moreover, coil drive portion 150 shown in Fig. 7 can also have the coil resistance measurement pattern as the 5th mode.
For the first mode to fourth mode, output control unit 145 can control coil drive portion 150, so that
First current source 55 export 0(zero) [A] value.Alternatively, for the first mode to fourth mode, output control unit 145
It can control coil drive portion 150, so that operating as being not present the first current source 55.
During the 5th mode operation, that is, with during coil resistance measurement pattern operating, VCM is driven
Device 10 can be control as follows.
First, it can control so that the first current source 55 being connected in coil driving portion 150 into coil drive portion 150
(example: first terminal OUT1 or Second terminal OUT2 provides tool to a terminal in two terminals of coil 240 existing for outside
Have pre-determined value measures electric current I as the first of constant currentM.Control signal for this control can be controlled by output
Portion 145 or PID control portion 140 processed or other control unit (not shown) are generated, are exported.
Second, the first measurement electric current I is provided in the first current source 55MPeriod, that is, with coil resistance measurement
During mode operation, the another terminal (example: Second terminal OUT2 or first terminal OUT1) that is connected in described two terminals
Two transistors in some transistor remain open state so that it is described first measurement electric current IMIt can
It is flowed by coil 240 and some described transistor.For example, some transistor can be company in described two transistors
It is connected to the transistor of reference potential GND.Control signal for this control can be by output control unit 145 or (not shown) another
Outer control unit is generated, is exported.
Third provides the first measurement electric current I in the first current source 55MPeriod, that is, with coil resistance measurement
During mode operation, it can control so that except some described crystal in 4 transistors 51 ~ 54 that coil drive portion 150 includes
Remaining 3 transistor except pipe have off state.For this control control signal can by output control unit 145 or
Other control unit (not shown) is generated, is exported.
4th, can control so that first switch 19 is by ADC19's during coil resistance measurement pattern operating
Differential output terminal is connected to feedback path P1.Different from this, be not the coil resistance measurement pattern above-mentioned
During one mode is operated to fourth mode, it can control so that the differential output terminal of ADC19 is connected to by first switch 19 puts
The output terminal in big portion 120.Alternatively, to be not the above-mentioned first mode of the coil resistance measurement pattern to fourth mode
During operating, the differential output terminal of ADC19 can be connected to the output signal side of Hall sensor 110 by first switch 19.
Control signal for this control can be supplied to first switch 19, can be by PID control portion 140 or (not shown) other
Control unit is generated, is exported.
In one embodiment, first switch 19 can be provided only the differential output terminal of ADC19 being connected to feedback road
Diameter P1 or be connected to Hall sensor 110 output signal side two kinds of connection modes.
The feedback path P1 can provide drive from being connected in 10 input and output terminal of VCM driving device to coil 240
The terminal (OUTP) of streaming current and 2 signal wires of terminal (OUTN) are constituted.At this point, the terminal (OUTP) of VCM driving device 10
And terminal (OUTN) is first terminal OUT1 and Second terminal OUT2 with the first current source 55 in electrically identical node.Cause
This, as shown in fig. 7, feedback path P1 can also be showed as since the first current source 55.The feedback path P1 is used for
Potential difference between terminal (OUTP) and terminal (OUTN) is provided, thus the specific method for constituting this feedback path P1 can multiplicity
Ground provides, and can be provided according to the common installation ability of practitioner.
5th, with during coil resistance measurement pattern operating, as the voltage obtained by feedback path P1,
ADC130, which can be exported, measures voltage V about the first of 240 both end voltage of coilM.At this point, PID control portion 140 or (not shown)
Other control units can use the first measurement electric current I with the pre-determined valueMWith the first measurement voltage VM, calculate
The resistance value of coil 240.Alternatively, the first measurement electric current IMIt is the known value determined, thus PID control portion 140 or not
Other described control units of diagram can use the first measurement voltage VM, calculate the resistance value of coil 240.
If accessing power supply to VCM driving device 10, VCM driving device 10 is in above-mentioned 5 kinds of modes or other
A certain mode in additional mode.At this point, for 10 pattern conversion of VCM driving device and with the coil resistance measurement pattern
Operating, user can assign mode conversion order by user interface 40.Host 30 can use I2C communication protocol, pass through
This user order is passed to VCM driving device 10 by SCL171 the and SDA172 terminal of VCM driving device 10.
240 resistance value of coil that VCM driving device 10 is operated and calculated with the coil resistance measurement pattern, can store
In EEPROM142, and/or I2C communication protocol is utilized, passes to host 30 and user interface 40.The resistance value of the storage can
With the parameter setting for VCM driving device 10.The function of storing or transmit 240 resistance value of coil of the calculating, can borrow
Help PID control portion 140, output control unit 145 or other control units (not shown) and executes.
If it is assumed that the input dynamic range of ADC130 is a volt, the resolution ratio of ADC is N- bit resolution, then can count
Calculation and a/2NThe corresponding ADC input voltage of 1 LSB of -1 volt.
First current source 55 can changeably be used as constant current source.B ampere-hour is exported when being set as the first current source 55,
If it is assumed that represent the ADC130 output code of the potential difference between first terminal OUT1 and Second terminal OUT2 as c LSB, then line
The resistance value r of circle 240 can be determined as a/2 r=c *N -1 / b。
For example, when assume ADC130 input dynamic range be 1 volt, ADC130 be 10 bit A/D C when, can calculate with
The corresponding ADC input voltage of 1 LSB of 1000mV/1023LSB.
Moreover, when setting 1mA for the output valve of the first current source 55, if it is assumed that represent first terminal OUT1 and
The ADC130 output code of potential difference between two-terminal OUT2 is 30 LSB, then, at this point, the resistance value of coil 240 can determine
It is set to 30 1000mV/1023 */ohm of 1 mA=29.3255.
When (a) of such as Fig. 7 is shown to be constituted, if representing the potential difference between first terminal OUT1 and Second terminal OUT2
ADC130 output code has positive value, then when the composition shown in (a) of such as Fig. 7, represents first terminal OUT1 and Second terminal
The ADC130 output code of potential difference between OUT2 has negative value.
Using the above-mentioned embodiment of the present invention, the technical staff of technical field can be originally without departing from the present invention
Easily implement multiplicity change and revision in the range of matter characteristic.The content of each claim of claims can pass through
This specification and be understood that in the range of, be incorporated into other claims of not adduction relationship.
Claims (8)
1. a kind of VCM driving device, as by the first electric current input and output terminal and the second electric current input and output terminal to
External coil provides the VCM driving device of driving current,
Including having the coil drive portion of the first current source and ADC；
During mode operation of the VCM driving device to measure the resistance value of the coil, first electric current is 1. controlled
Source, so that flowing through the first pre-determined measurement electric current by the coil, 2. making the first electric current input and output
Potential difference between terminal and the second electric current input and output terminal is input into the ADC, moreover, 3. making based on the current potential
Difference calculates the resistance value of the coil.
2. VCM driving device according to claim 1, wherein
Current output terminal in two terminals of first current source, passes through the first electric current input and output terminal and institute
Certain one in the second electric current input and output terminal is stated, a terminal of the coil is connected to,
During mode operation of the VCM driving device to measure the resistance value of the coil, the another terminal of the coil
It is connected to arbitrary current path, so that the first measurement electric current passes through the coil flowing.
3. VCM driving device according to claim 1, wherein
The coil drive portion further includes multiple transistors that H- bridge circuit is together constituted with the coil,
During mode operation of the VCM driving device to measure the resistance value of the coil, 1. only by the multiple crystal
A transistor in pipe remains open state, moreover, the 2. current output terminal in two terminals of first current source
Son is connected to described by certain one in the first electric current input and output terminal and the second electric current input and output terminal
One terminal of coil,
It is described to keep it turned on during mode operation of the VCM driving device to measure the resistance value of the coil
One transistor is that the coil another terminal person is connected in the multiple transistor.
4. VCM driving device according to claim 1, which is characterized in that
When other mode operations except mode of the VCM driving device to measure the resistance value of the coil, control makes
The first current source output is obtained substantially with the electric current of 0 value, or control is at the electric current output of first current source
Terminal is not attached to the state of the first electric current input and output terminal and the second electric current input and output terminal.
5. VCM driving device according to claim 1, wherein
Further include: feed back the potential difference between the first electric current input and output terminal and the second electric current input and output terminal
Feedback path；Hall sensor voltage offer portion including Hall sensor；And first switch；
During mode operation of the VCM driving device to measure the resistance value of the coil, the first switch is controlled, is made
The feedback path is connected to the input terminal of the ADC by the first switch, so as to the potential difference be input into it is described
ADC, moreover,
When other mode operations except mode of the VCM driving device to measure the resistance value of the coil, institute is controlled
First switch is stated, so that the potential difference is not input into the ADC, and the output voltage in the Hall sensor voltage offer portion
It is input into the ADC.
6. VCM driving device according to claim 1, wherein
The coil drive portion further includes multiple transistors that H- bridge circuit is together constituted with the coil,
The VCM driving device further include:
PID control portion, checks whether the digital value for receiving input from the ADC occurs mistake；And
Output control unit generates the control letter of the unlatching off state for the multiple transistor that control coil driving portion includes
Number.
7. VCM driving device according to claim 1, wherein further include:
Storage unit；And
Communication interface comprising communication clock terminal and communication data terminal；
If receiving pre-determined order by the communication interface, then make the resistance value for being converted into measuring the coil
Mode,
The resistance value of the coil of the calculating is stored in the storage unit, or is supplied to outside by the communication interface
Portion.
8. a kind of current driving device, comprising:
The VCM driving device of a certain item in claim 1 to 7；And
VCM including the coil；
The VCM driving device is installed in the shell of the VCM,
Two terminals, the first electric current input and output terminal and the second electric current input and output terminal of the coil do not reveal
For the shell exterior of the VCM,
Communication clock terminal, communication data terminal, power supply terminal and the reference potential terminal formed in the VCM driving device
It is exposed to the shell exterior of the VCM.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020180051270A KR102179960B1 (en) | 2018-05-03 | 2018-05-03 | Method for measuring resistance of a coil of a voice coil motor actuator and VCM driver IC for the same |
| KR10-2018-0051270 | 2018-05-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110441605A true CN110441605A (en) | 2019-11-12 |
| CN110441605B CN110441605B (en) | 2022-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910325934.5A Active CN110441605B (en) | 2018-05-03 | 2019-04-15 | Method for measuring coil resistance of VCM and VCM driving apparatus used for the same |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR102179960B1 (en) |
| CN (1) | CN110441605B (en) |
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| CN1836368A (en) * | 2003-08-21 | 2006-09-20 | 罗姆股份有限公司 | Motor driver and magnetic disc apparatus |
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| KR20140007249A (en) * | 2012-07-06 | 2014-01-17 | 삼성전기주식회사 | Apparatus and method for driving voice coil motor |
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| JP2015091092A (en) * | 2013-11-07 | 2015-05-11 | 富士通セミコンダクター株式会社 | Driver circuit and semiconductor integrated circuit device |
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| JP3940137B2 (en) | 2003-05-29 | 2007-07-04 | オーツー マイクロ， インコーポレーテッド | Differential load drive circuit |
| KR100532483B1 (en) * | 2003-12-12 | 2005-12-02 | 삼성전자주식회사 | Calibration method and apparatus therefor |
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|---|---|---|---|---|
| KR19990056832A (en) * | 1997-12-29 | 1999-07-15 | 윤종용 | Performance test circuit of voice coil motor of hard disk driver |
| US6542324B1 (en) * | 2000-03-21 | 2003-04-01 | Stmicroelectronics S.R.L. | Digital control of the speed of a motor by a power stage driven in discontinuous mode |
| CN1836368A (en) * | 2003-08-21 | 2006-09-20 | 罗姆股份有限公司 | Motor driver and magnetic disc apparatus |
| US20090128946A1 (en) * | 2007-11-15 | 2009-05-21 | Seagate Technology, Llc. | Discontinuous mode back emf measurement |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR102179960B1 (en) | 2020-11-17 |
| CN110441605B (en) | 2022-01-18 |
| KR20190127113A (en) | 2019-11-13 |
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